CN108599243A - Power frequency voltage change-based power grid island black start device and method - Google Patents
Power frequency voltage change-based power grid island black start device and method Download PDFInfo
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- CN108599243A CN108599243A CN201810398479.7A CN201810398479A CN108599243A CN 108599243 A CN108599243 A CN 108599243A CN 201810398479 A CN201810398479 A CN 201810398479A CN 108599243 A CN108599243 A CN 108599243A
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- 230000001681 protective effect Effects 0.000 claims description 43
- 238000005259 measurement Methods 0.000 claims description 7
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a power grid island black start device and a method based on power frequency voltage change, wherein the power grid island black start device comprises a connecting line, an acquisition unit and a protection device; the control switch is arranged on the connecting line and used for connecting the small unit system and the infinite equivalent system; the acquisition unit is connected with the connecting line and is used for measuring the voltage on two sides of the connecting line and transmitting the measured value to the protection device; and the protection device is used for disconnecting the control switch to enable the small unit system and the infinite equivalent system to be disconnected and operated with auxiliary power when the voltage and the change rate thereof meet the action criterion of the protection device, so as to prepare for starting the main power plant. The method is a starting method of the black-start device for the power grid island. The invention has the characteristic of good quick start, can reduce the investment cost of a black start device, greatly shortens the recovery time of a power grid, and reduces economic loss and social influence.
Description
Technical field
The present invention relates to power grid"black-start" technical fields, and in particular to a kind of power grid isolated island based on power-frequency voltage variation is black
Starter and method.
Background technology
Recently as the continuous increase of major regional power grid scale and capacity, the contact between system is increased, electricity
The safe and stable operation of Force system subjects huge test.Although metropolitan grid structure and safety and stability level are more previous
When having large increase, but meeting with catastrophe failure, it is possible to causing the chain reaction of system, large-area power-cuts is eventually led to
Accident.The major accidents such as the beautiful ash moss of in August, 2003 have beaten alarm bell to power worker, and people is made to be fully recognized that greatly
The diversity and unpredictability of safety at power cut.Once and accident occurs, and takes suitable effective black starting-up prediction scheme can be most
Make system resumes power in the short time, the accident of substantially reducing brings the harmful effect of economy and society.For modern city electricity
For net, general hydroelectric resources is more deficient, selects self-starting gas turbine then to be invested as black start source larger.Therefore having must
Study a kind of new black starting-up pattern.
Invention content
The present invention is directed to solve the technical problems existing in the prior art at least to some extent, propose a kind of based on work
The power grid isolated island black starting-up device and method of frequency voltage change, has the characteristics of good quick startup, can reduce black open
The cost of investment of dynamic device, improves the practicability and economic benefit of black starting-up device.
In order to realize the object of the invention, embodiment, which provides, according to a first aspect of the present invention a kind of is changed based on power-frequency voltage
Power grid isolated island black starting-up device specifically uses following technical scheme：
The power grid isolated island black starting-up device based on power-frequency voltage variation includes interconnection, collecting unit and protection dress
It sets；It is provided with control switch on the interconnection, is used to connect the valve systems such as small machine set system and infinity；The acquisition is single
It is first to be connect with the interconnection, it is used to measure the voltage of the interconnection both sides and fills transmitting measured values to the protection
It sets；The protective device is used for when the voltage and its change rate meet protective device operating criterion, is disconnected the control and is opened
It closes so that small machine set system and infinitely great equivalent system sectionalizing and house load operation, prepare to start power plant of the main force.
Optionally, the collecting unit includes isolated island side mutual inductor and big system side mutual inductor, isolated island side mutual inductor,
Protective device and big system side mutual inductor are sequentially connected, and isolated island side mutual inductor connects with interconnection close to small machine set system side
It connects, the big system side mutual inductor is connect with interconnection close to the valve systems such as infinity side.
Optionally, the control switch includes first switch and the second switch, and the first switch is close to the isolated island side
The junction of mutual inductor and interconnection is arranged, and the second switch is close to the junction of big the system side mutual inductor and interconnection
Setting.
Optionally, the protective device connect the voltage U will measure with isolated island side mutual inductor by signal wiremIt passes
The protective device is transported to, the protective device connect the voltage will measure with the big system side mutual inductor by signal wire
UmIt is transmitted to the protective device.
Optionally, the operating criterion is expressed as with formula once：
|Um|+τ|dU/dt|≤Ua1
Wherein, UmFor the voltage value that mutual inductor measuring obtains, dU/dt is the change rate of the voltage measured, Ua1For voltage limits；
Work as UmWhen meeting above-mentioned formula, switch is controlled described in the protective device action tripping.
Embodiment also provides a kind of power grid isolated island black starting-up side changed based on power-frequency voltage according to a second aspect of the present invention
Method comprising the power grid isolated island black starting-up device based on power-frequency voltage variation described in preceding embodiment, the method includes such as
Lower step：
Described method includes following steps：
(1) collecting unit measures the voltage of the interconnection both sides, and voltage measuring value is transmitted to the protection
Device；
(2) protective device receives the voltage measuring value, and judges that the voltage change ratio dU/dt measured values meet
When operating criterion, then protection act, small machine set system and infinitely great equivalent system sectionalizing and house load operation, to start the main force
Power plant prepares；When the voltage change ratio dU/dt measured values do not meet operating criterion, small machine set system is incorporated into the power networks.
Optionally, the step (1) specifically includes：Isolated island side inductor measures the interconnection and the small unit
The voltage of system connection side is simultaneously transmitted to the protective device by signal wire；The big system side inductor measures described
Winding thread connect the voltage of side with valve systems such as the infinities and is transmitted to the protective device by signal wire.
Optionally, the step (2) specifically includes：
When the voltage value of measurement meets following formula | Um|+τ|dU/dt|≤Ua1When, protective device action tripping institute
State control switch, small machine set system and infinitely great equivalent system sectionalizing and house load operation；The voltage change ratio dU/dt is surveyed
When magnitude does not meet operating criterion, small machine set system is incorporated into the power networks；
Wherein, UmFor the voltage value that mutual inductor measuring obtains, dU/dt is the change rate of the voltage measured, Ua1For voltage limits.
Optionally, in the step (2),
Um=Ecos (δ/2)
Ua1=E/2
Wherein, δ is that the steady state stability limit generator rotor angle of the valve systems such as small machine set system and infinity is poor, and E is constant.
Compared with prior art, implement device and method of the embodiment of the present invention to have the advantages that：
Garbage power plant Deng Fei main forces unit may be used using interconnection both sides electricity in the small machine set system of the embodiment of the present invention
Pressure and its change rate to determine whether according to plan Active Splitting formed isolated island, recycle the isolated island carry out black starting-up, relative to biography
For black starting-up mode of uniting, the economic cost of black starting-up device is significantly reduced, while having the advantages that good quickly startup.
If after mains breakdown, part of generating units can realize self-insurance station service and maintain generator synergic system, then can carry out immediately
Power supply is directly powered toward power grid by these units, and the rapid power demand for solving key sector and gradually expansion restore range,
To greatly shorten the power system restoration time, reduce economic loss and social influence.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is power grid isolated island black starting-up apparatus structure schematic diagram provided in an embodiment of the present invention；
Fig. 2 is isolated island start-up mode black starting-up flow chart provided in an embodiment of the present invention；
Fig. 3 is power grid isolated island black-start method flow chart provided in an embodiment of the present invention.
Specific embodiment
In being described below, for illustration and not for limitation, it is proposed that such as tool of particular system structure, technology etc
Body details understands the embodiment of the present invention to cut thoroughly.However, it will be clear to one skilled in the art that there is no these specific
The present invention can also be realized in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment combination attached drawing.
The embodiment of the present invention provides a kind of power grid isolated island black starting-up device changed based on power-frequency voltage, is applied to power grid
The fast recovery of power supply of system, the protection of conventional isolated island off-the-line are general using the phase angle difference preset between isolated island and system, difference on the frequency
Deng being used as operating criterion, and the power grid isolated island black starting-up device of the embodiment of the present invention is based on power-frequency voltage and its change rate as dynamic
Make criterion, and garbage power plant is present among each big city for general at present.In contrast, the isolated island start-up mode of garbage power plant is thrown
Money is smaller, is a kind of new black starting-up pattern.On the basis of practical operating experiences, the present embodiment is using garbage power plant as lonely
Island unit, but isolated island unit is not limited to garbage power plant, can also be other non-main force's units, and propose technology in detail below
Scheme：
As shown in Figure 1, in one embodiment, the power grid isolated island black starting-up device include interconnection, collecting unit and
Protective device；It is provided with control switch on the interconnection, is used to connect the valve systems such as small machine set system and infinity, this is small
Machine set system is isolated island machine set system, the equivalent system of infinity for bulk power grid equal valve systems；The collecting unit with it is described
Winding thread connects, and is used to measure the voltage of the interconnection both sides and by transmitting measured values to the protective device；The protection
Device is used for when the voltage and its change rate meet protective device operating criterion, is disconnected the control and is switched so that small unit
System and infinitely great equivalent system sectionalizing and house load operation, prepare to start power plant of the main force.Voltage of oscillation center UmFor
The average value of both sides voltage, when network system is disturbed, voltage of oscillation center UmSize become with two machine generator rotor angle difference δ
Change, therefore what technical staff can meet according to practical work experience, technology requirement and target setting voltage and its change rate
Protective device acts when kind condition, therefore is not defined to the operating criterion in the present embodiment.
Wherein, if it is desired to which unit can become isolated island by Active Splitting when accident may occur, it is contemplated that practicability and warp
Ji benefit, should select non-main force's unit that capacity is small, can not be incorporated into the power networks.By taking the burning power plant of Shenzhen South Mountain as an example, hair
Motor is a two pole synchronous generator of QF-12-2 types three-phase alternating current, rated power 12MW, single machine maximum output 15MW, volume
Constant voltage 10.5kV.It can pass through interconnection with bulk power grid paired running or islet operation in the case where catastrophe occurs for power grid
Station service can be provided for neighbouring gas turbine unit, auxiliary gas turbine is started, to carry out further system
Restore.The investment that large-sized diesel generating set is equipped with for gas turbine can be saved in this way, and it is fireballing to be likewise supplied with startup
Feature.
As can be seen from the above description, power grid isolated island black starting-up device described in the present embodiment has the good spy quickly started
Point can reduce the cost of investment of black starting-up device, improve the practicability and economic benefit of black starting-up device.
Wherein, isolated island, which starts, is used as a kind of black starting-up pattern, it is desirable that isolated network under any circumstance being capable of stable operation.This
It also means that if setting up isolated island in entire electric system starts scheme, when any catastrophe, failure occurs in bulk power system
Or when disturbance, unit and catastrophe system sectionalizing are formed into isolated island by protection and automatic device by prior scheduled mode.If problem
Solve, then by isolated island again with bulk power grid paired running；Further restored by the isolated island if having a power failure on a large scale,
It is as shown in Figure 2 that it restores flow.
Mini system side voltage data is obtained as shown in Figure 2, this side is transmitted in isolated island device through communication channel to side data
In handled.The active solution of the small unit in big system jam and catastrophe can be realized using isolated island protective device
Row.By the measurement of the parameter of interconnection both sides between small unit and big system, come constitute protective device action principle and
Basis for estimation, when measured value meets operating criterion, protection enters time delay process, delay time t, while being in determining system
It is no to have catastrophe or failure.T could be provided as operating time of protection, if power outage occurs really, or the delay t times
Terminate not yet to determine system mode, then protection act, small unit and big system sectionalizing and house load operation, to start main force's electricity
Factory prepares；If large-scale blackout does not occur or system restores stable operation again, protection is failure to actuate, small machine
Group continues to be incorporated into the power networks.
As can be seen from the above description, power grid isolated island black starting-up device described in the present embodiment has the good spy quickly started
Point can reduce the cost of investment of black starting-up device, improve the practicability and economic benefit of black starting-up device.
In one embodiment, the collecting unit is preferably but not limited to include isolated island side mutual inductor and big system side mutual inductance
Device, isolated island side mutual inductor, protective device and big system side mutual inductor are sequentially connected, isolated island side mutual inductor and interconnection
It is connected close to small machine set system side, for the voltage of the side of measurement interconnection；The big system side mutual inductor and contact
Line is connected close to the valve systems such as infinity side, for the voltage of the other side of measurement interconnection.In the present embodiment, isolated island side
Mutual inductor and big system side mutual inductor are voltage transformer.
In one embodiment, the control switch includes first switch and the second switch, and the first switch is close to institute
The junction for stating isolated island side mutual inductor and interconnection is arranged, and the second switch is close to the big system side mutual inductor and interconnection
Junction setting.The first switch and the second switch can select killer switch either breaker and disconnecting switch
Tandem compound switchs, and first switch can correspond to isolated island side mutual inductor, the voltage and its variation that mutual inductor detects when isolated island side
When rate meets criterion, first switch off-the-line isolated island is disconnected；Second switch can correspond to big system side mutual inductor, when big system side is mutual
When the voltage and its change rate that sensor detects meet criterion, second switch off-the-line isolated island is disconnected, to improve switch tripping solution
The response speed of row isolated island.
In one embodiment, the protective device is connect with isolated island side mutual inductor by signal wire, the protection
Device is connect with the big system side mutual inductor by signal wire.Fiber optic cables can be selected but be not limited to the signal wire,
The voltage parameter of measurement is transmitted to protective device by signal wire.
For the stability for ensureing after isolated island black start source off-the-line, it is necessary to ensure that automatic device is in the system that detects and default orphan
When island both ends electrical quantity is more abnormal, Active Splitting device should be as fast as possible by isolated island and system sectionalizing.Therefore, at one
In embodiment, the operating criterion is expressed as with formula once：
|Um|+τ|dU/dt|≤Ua1
Wherein, UmFor the voltage value that mutual inductor measuring obtains, dU/dt is the change rate of the voltage measured, Ua1For voltage limits；
Work as UmWhen meeting above-mentioned formula, switch is controlled described in the protective device action tripping.T is operating time of protection,
Different deferred action is set according to different voltage values, which corresponds to table and can calculate and be stored in protective device in advance, protects
Call delay to improve quick-action by comparing when shipping sth. under guard row.
It should be noted that the specific time of t can also determine according to other modes, such as according to protective device and it is
Operating experience of uniting statistics determines a specific value.
The embodiment of the present invention uses the voltage of oscillation center U of interconnection between isolated island and systemmAnd its voltage change ratio dU/dt
It constitutes and protects for operating criterion, realize quick off-the-line.When system is disturbed, voltage of oscillation center UmSize with two machine work(
Angular difference δ changes, voltage of oscillation center UmAnd its change rate dU/dt reflect respectively the change rate d δ of generator rotor angle δ and generator rotor angle/
Dt, by measuring voltage and its change rate, with operating criterion | Um|+τ|dU/dt|≤Ua1Compare, so as to predict step-out, realizes
Quick off-the-line..
In addition, the embodiment of the present invention also provides a kind of power grid isolated island black-start method changed based on power-frequency voltage, packet
The power grid isolated island black starting-up device changed based on power-frequency voltage described in preceding embodiment is included, described method includes following steps：
(1) collecting unit measures the voltage of the interconnection both sides, and voltage measuring value is transmitted to the protection
Device；
(2) protective device receives the voltage measuring value, and judges that the voltage change ratio dI/dt measured values meet
When operating criterion, protection enters time delay process, while determining in system whether there is catastrophe or failure, if stopped really
Electrification or time delay process terminate not yet to determine system mode, then protection act, the valve systems solution such as small machine set system and infinity
Simultaneously house load operation is arranged, is prepared to start power plant of the main force；The voltage change ratio dI/dt measured values do not meet operating criterion
When, small machine set system is incorporated into the power networks.
The embodiment of the present invention uses the voltage of oscillation center U of interconnection between isolated island and systemmAnd its voltage change ratio dU/dt
It constitutes and protects for operating criterion, realize quick off-the-line.When system is disturbed, voltage of oscillation center UmSize with two machine work(
Angular difference δ changes, voltage of oscillation center UmAnd its change rate dU/dt reflect respectively the change rate d δ of generator rotor angle δ and generator rotor angle/
Dt, by measuring voltage and its change rate, with operating criterion | Um|+τ|dU/dt|≤Ua1Compare, so as to predict step-out, realizes
Quick off-the-line.Further, in one embodiment, the step (1) specifically includes：Described in isolated island side inductor measures
Interconnection connect the voltage of side with the small machine set system and is transmitted to the protective device by signal wire；The big system
Side inductor measures the valve systems such as the interconnection and the infinity and connect the voltage of side and be transmitted to institute by signal wire
State protective device.
Further, in one embodiment, the step (2) specifically includes：
When the voltage value of measurement meets following formula | Um|+τ|dU/dt|≤Ua1When, protective device action tripping institute
State control switch, small machine set system and infinitely great equivalent system sectionalizing and house load operation；The voltage change ratio dU/dt is surveyed
When magnitude does not meet operating criterion, small machine set system is incorporated into the power networks；
Wherein, UmFor the voltage value that mutual inductor measuring obtains, dU/dt is the change rate of the voltage measured, Ua1For voltage limits.
Optionally, in the step (2),
Um=Ecos (δ/2)
Ua1=E/2
Wherein, δ is that the steady state stability limit generator rotor angle of the valve systems such as small machine set system and infinity is poor, and E is constant, TsFor when
Between setting valve,To shake angle setting valve.Um=Ecos (δ/2) takes steady state stability limit angle δ=120 °, corresponding Ua1=E/
2,τ is obtained greatly, and step-out detection is fast, but is easy malfunction；Conversely, τ is smaller, isolated island device is also reliable, no
Easy malfunction, but predicting function is smaller.
Specifically, protective device includes by the timer of computation delay time and by calculating based on voltage change ratio
Unit is calculated, the step flow of the power grid isolated island black-start method changed based on power-frequency voltage is described in detail below, such as Fig. 3
It is shown：
(1) voltage value as obtained by calculating and measure, is calculated isolated island device installation point voltage and voltage change ratio；
(2) voltage and voltage change ratio bring criterion into | Um|+τ|dU/dt|≤Ua1, continue if setting up, it is invalid to return
It returns, wherein t is operating time of protection；
(3) meet criterion | Um|+τ|dU/dt|≤Ua1, switch trip is controlled, small machine set system off-the-line carries out isolated island startup.
As can be seen from the above description, implement device and method of the embodiment of the present invention to have the advantages that：
Garbage power plant Deng Fei main forces unit may be used using interconnection both sides electricity in the small machine set system of the embodiment of the present invention
Buckling rate to determine whether according to plan Active Splitting formed isolated island, recycle the isolated island carry out black starting-up, relative to tradition it is black
For Starting mode, the economic cost of black starting-up device is significantly reduced, while having the advantages that good quickly startup.If
After mains breakdown, part of generating units can realize self-insurance station service and maintain generator synergic system, then can be powered immediately,
It directly powers toward power grid by these units, the rapid power demand for solving key sector simultaneously gradually expands recovery range, to
Greatly shorten the power system restoration time, reduce economic loss and social influence.
Part not deployed in devices and methods therefor in the embodiment of the present invention can refer to device and its side of above example
The corresponding part of method, is no longer developed in details herein.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. mean the specific features described in conjunction with the embodiment or example,
Structure, material or feature are included at least one embodiment or example of the invention.In the present specification, to above-mentioned term
Schematic representation may not refer to the same embodiment or example.Moreover, description specific features, structure, material or
Feature can be combined in any suitable manner in any one or more of the embodiments or examples.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein sequence that is shown or discussing can not be pressed,
Include according to involved function by it is basic simultaneously in the way of or in the opposite order, to execute function, this should be by the present invention's
Embodiment person of ordinary skill in the field is understood.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (9)
1. a kind of power grid isolated island black starting-up device based on power-frequency voltage variation, which is characterized in that including interconnection, collecting unit
And protective device；It is provided with control switch on the interconnection, is used to connect the valve systems such as small machine set system and infinity；Institute
It states collecting unit to connect with the interconnection, is used to measure the voltage of the interconnection both sides and by transmitting measured values to described
Protective device；The protective device is used for when the voltage and its change rate meet protective device operating criterion, described in disconnection
Control switch does standard so that small machine set system and infinitely great equivalent system sectionalizing and house load operation to start power plant of the main force
It is standby.
2. the power grid isolated island black starting-up device as described in claim 1 based on power-frequency voltage variation, which is characterized in that described to adopt
It includes isolated island side mutual inductor and big system side mutual inductor to collect unit, and isolated island side mutual inductor, protective device and big system side are mutual
Sensor is sequentially connected, and isolated island side mutual inductor is connect with interconnection close to small machine set system side, the big system side mutual inductance
Device is connect with interconnection close to the valve systems such as infinity side.
3. the power grid isolated island black starting-up device as claimed in claim 2 based on power-frequency voltage variation, which is characterized in that the control
System switch includes first switch and the second switch, and the first switch is close to the junction of isolated island side mutual inductor and interconnection
Setting, the second switch are arranged close to the junction of the big system side mutual inductor and interconnection.
4. the power grid isolated island black starting-up device as claimed in claim 2 based on power-frequency voltage variation, which is characterized in that the guarantor
Protection unit connect the voltage U will measure with isolated island side mutual inductor by signal wiremIt is transmitted to the protective device, it is described
Protective device connect the voltage U will measure with the big system side mutual inductor by signal wiremIt is transmitted to the protective device.
5. the power grid isolated island black starting-up device as described in claim 1 based on power-frequency voltage variation, which is characterized in that described dynamic
Make criterion to be expressed as with formula once：
|Um|+τ|dU/dt|≤Ua1
Wherein, UmFor the voltage value that mutual inductor measuring obtains, dU/dt is the change rate of the voltage measured, Ua1For voltage limits；
Work as UmWhen meeting above-mentioned formula, switch is controlled described in the protective device action tripping.
6. a kind of startup method of power grid isolated island black starting-up device as described in claim 1, which is characterized in that the method includes
Following steps：
(1) collecting unit measures the voltage of interconnection both sides, and voltage measuring value is transmitted to protective device；
(2) protective device receives the voltage measuring value, and judges that the voltage change ratio dU/dt measured values meet operating criterion
When, then protection act, small machine set system and infinitely great equivalent system sectionalizing and house load operation do standard to start power plant of the main force
It is standby；When the voltage change ratio dU/dt measured values do not meet operating criterion, small machine set system is incorporated into the power networks.
7. starting method as claimed in claim 6, which is characterized in that the step (1) specifically includes：Isolated island side inductance
Device measures the interconnection and connect the voltage of side with the small machine set system and be transmitted to the protective device by signal wire；
The big system side inductor measures the valve systems such as the interconnection and the infinity and connect the voltage of side and pass through signal
Line is transmitted to the protective device.
8. starting method as claimed in claim 7, which is characterized in that the step (2) specifically includes：
When the voltage value of measurement meets following formula | Um|+τ|dU/dt|≤Ua1When, the protective device acts to be controlled described in tripping
System switch, small machine set system and infinitely great equivalent system sectionalizing and house load operation；The voltage change ratio dU/dt measured values
When not meeting operating criterion, small machine set system is incorporated into the power networks；
Wherein, UmFor the voltage value that mutual inductor measuring obtains, dU/dt is the change rate of the voltage measured, Ua1For voltage limits.
9. starting method as claimed in claim 8, which is characterized in that in the step (2),
Um=E cos (δ/2)
Ua1=E/2
Wherein, δ is that the steady state stability limit generator rotor angle of the valve systems such as small machine set system and infinity is poor, and E is constant, TsIt is whole for the time
Definite value,To shake angle setting valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810398479.7A CN108599243A (en) | 2018-04-28 | 2018-04-28 | Power frequency voltage change-based power grid island black start device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810398479.7A CN108599243A (en) | 2018-04-28 | 2018-04-28 | Power frequency voltage change-based power grid island black start device and method |
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| CN108599243A true CN108599243A (en) | 2018-09-28 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798784A (en) * | 2012-08-21 | 2012-11-28 | 国网新源水电有限公司新安江水力发电厂 | Method for testing large-scale load of black startup of hydraulic power plant |
| CN103812131A (en) * | 2013-10-29 | 2014-05-21 | 国网辽宁省电力有限公司沈阳供电公司 | Multi-agent-based urban power grid isolated island black-start system and method |
| CN105244912A (en) * | 2015-10-27 | 2016-01-13 | 上海电力学院 | Method for active power distribution network island power supply recovery and black-start |
-
2018
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798784A (en) * | 2012-08-21 | 2012-11-28 | 国网新源水电有限公司新安江水力发电厂 | Method for testing large-scale load of black startup of hydraulic power plant |
| CN103812131A (en) * | 2013-10-29 | 2014-05-21 | 国网辽宁省电力有限公司沈阳供电公司 | Multi-agent-based urban power grid isolated island black-start system and method |
| CN105244912A (en) * | 2015-10-27 | 2016-01-13 | 上海电力学院 | Method for active power distribution network island power supply recovery and black-start |
Non-Patent Citations (3)
| Title |
|---|
| 何晓峰: "孤岛黑启动模式在垃圾电厂中的运用", 《大众用电》 * |
| 林仁磊: "孤岛黑启动模式下孤岛稳定性因素评估", 《水电能源科技》 * |
| 陈石通: "孤岛启动模式下的预置保护和自动装置研究", 《电力***保护与控制》 * |
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